William e



W. E. DARTS.

PERMUTATION Locm APPLICATION FILED FEB. 12, 1919.

. Patented Oct. 21, 1919.

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UmTuD sTATns PATENT orriGEf WILLIAM E. DAnTs, or lnnrcironn,.coNNEo'JIIoiJT.

f PERIVIUTATIO'N-LOCK.

Application filed February 12, 1919. Serial No. 276,620.

fication.

This invention Yhas relation to door locks, with special reference to locks of the permutation type and has for an object to provide a lock of this nature which is extremely simple in construction, embodying a minimum number of parts, thereby insuring the economical manufacture of the lock as well as positiveness in operation and security in effect.

Y Another object of the invention is to provide a permutation lock, designed particularly for use in connection with sliding doors, although it will be presently obvious that the lock, with modification may be equally well adapted for use in swinging doors for doors of any type, and in which there is embodied a sliding bolt adapted to secure Ythe keeperof an adjacent jamb or coacting door, and permutation means for precluding movement of the lock bolt in one position of the permutation element or permit such movement of the bolt when permutation elements are properly adjusted.

Another object of the invention is to provide a permutation lock of the character above set forth embodying a plurality of rotatable tumblers having recesses in which to receive pins movable with a locking bolt,

certain of said recesses being plugged whereby the plugs may be interchanged when it is desired to alter the combination.

In addition to the foregoing, this invention comprehends improvements in the de-V tails of construction and arrangement of parts, to be hereinafter described and particularly set forth in the appended claim.

In the accompanying drawings in which Similar and corresponding parts are designated by the same characters of reference throughout the several views in which they appear, Y

Figure 1 is a view in front elevation of the front plate of my improved lock illustrating Y a fragment of the door and the concealed lock in dotted lines.

Fig. 2 is a view in vertical section of my improved permutation look and Specication of Letters Patent.

Patentedoeaai, 1919.

Fig. 3 Vis a view in section takenfon the line'3-3of Fig. 2.

With reference tothe drawings, 10 and-11 indicate a pair of coacting doors-or a door and door jamb as the case may be, and'12 indicates a keeper having an enlarged and beveled end 13 to enter one end-of a lock casing 141 which is inserted in a mortiso in the door 11. The lock casing 14CV is divided by means of Va horizontal partition 15in the upper portion of which is aA horizontal, vertically movable bolt 16. 'Depending'from the bolt 16 are three pins 17 which are guided'in openings formed in the dividing wall 15.V One end of the bolt16is recessed as at 18 to receive the enlarged end13 of the keeper, and reduced as Vat 19l to permit said enlarged end of the keeper Yto pass by the end of the bolt. bolt 16 for vertical movement 5I provide) a plurality of ribs -20 which maybe integrally formed upon one lface plate of theloick casing, said'ribs being designed to enter corres spondingly formed recesses in the bolt 16. Vertical movement of the bolt withoutbinding is thus insured. Yl? or manipulating the bolt I .provide a lateral extendingV handle Y21 which-fis designed to pass through an opening formed in the door` and also throughs a slot 22 formed in an outer plate 23 which is secured to the door afterthelock is inserted in place therein. I also provide a pair of coiled springs 24: which bear against the under side of the bolt 16 and rest upon the dividing wall 15, thereby urging the former upward toward a locking position.

In the compartment below the dividing wall 15 I provide a plurality of tumblers, corresponding in number to the number of' pins 17, each tumbler consisting ofv a Vdisk 25 having a plurality of radial peripherialV internally threaded recesses 26. The recesses are filled by means of threaded plugs 27 with the exception of one recess in each tumbler. Each tumbler Vis furthermore In .order to guide the formed with a polygonal opening 28 in which to receive the correspondingly formed end 29 of an operating knob 30, opposite ends of said knob being rounded as at 31 to journal in the openings and the lock casing and to permit free movement of the operating knob. Each knob is furthermore provided with a series of numerals'or other indicia 32. Suitable pointers or indicating [.1 marks-33 are inscribed upon the face of plate 23 to indicate points at which the operating knob may be set with reference to the numerals inscribed thereon when t-he permutation elements are to be manipulated.

It will be obvious from Fig. 2 of the drawings that the parts are in a locked position. If the tumblers 25 are so disposed that less than all three of the recesses which are unplugged are disposed beneath the pins 18, the locking bolt 16 may not be lowered and consequently the keeper 12 cannot be withdrawn. To unlock the device it is necessary to rotate the tumblers 25 by means of the operating knobs 30 to dispose the unplugged recesses beneath the pins 17 Whereupon downward movement upon the handles 21 will cause the pins 17 to enter the recesses to a distant sutficient to permit the keeper 12 to 'be Withdrawn.

From the foregoing it will be obvious that the combination may be readily changed by removing certain of t-he plugs 27 and transposing them to the unplugged recesses. It will thus be seen that I have provided a permutation lock which is extremely simple in construction, comprising but a minimum number of parts. Obviously, the operation of the lock must be positive in view of this fact and the possibility of confusion in the manipulation thereof is considerably reduced. Other uses and advantages will readily occur to those skilled in the art to which this invention appertains.

lVhile I have illustrated and described my invention with some degree of particularity, I realize that in practice various alterations therein may be made. I therefore reserve the right and privilege of changing the form of the details of construction or otherwise altering the arrangement of the correlated parts without departing from the spirit of the invention or the scope of the appended claims.

Having thus described my invention, what I claim as new and desire to secure by United States Letters Patent is:

In a permutation lock, a casing having an end opening and transverse openings in its walls in registration, the openings in one Wall being larger than those in another, the longitudinal extending partition within the casing having transverse openings therein, a plurality of disks located within the casing having central square openings and internally threaded radial openings extending into their peripheries, spindles, one for each disk, a square portion on each spindle to enter the opening of its corresponding disk, a circular portion on the end of each squared portion to seat in the opening in the casing, a bar located within the casing and movable laterally, a plurality of pins carried by said bar entering the openings of the partition and to enter the openings of the disk when the latter are properly arranged, one end of the locking bar being bent laterally and recessed, and keeper to enter the end opening of the casing to engage the locking bar, and springs interposed between the partition and locking bar to retain the latter in locked position.

In testimony whereof I aflix my signature in presence of two witnesses.

WILLIAM E. DARTS. [n s] Witnesses BETTY H. LEIKIND, Louis H. KATZ.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

